Created module idea-test-framework and moved classes needed for idea tests there

Moved tests for completion and their test data into module idea-completion

idea/idea-completion/testData/basic/common/InGlobalPropertyInitializer.kt

@@ -0,0 +1,7 @@
+val testing = 12
+val test = "Hello"
+
+val more = test<caret>
+
+// EXIST: { lookupString: "test", itemText: "test", tailText: " (<root>)", typeText: "String", attributes: "" }
+// EXIST: { lookupString: "testing", itemText: "testing", tailText: " (<root>)", typeText: "Int", attributes: "" }